<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <title>Document</title>
    <style type="text/css">
        .tab ul {
            overflow: hidden;
            padding: 0;
            margin: 0;
        }
        
        .tab ul li {
            box-sizing: border-box;
            padding: 0;
            float: left;
            width: 100px;
            height: 45px;
            line-height: 45px;
            list-style: none;
            text-align: center;
            border-top: 1px solid blue;
            border-right: 1px solid blue;
            cursor: pointer;
        }
        
        .tab ul li:first-child {
            border-left: 1px solid blue;
        }
        
        .tab ul li.active {
            background-color: orange;
        }
        
        .tab div {
            width: 500px;
            height: 300px;
            display: none;
            text-align: center;
            font-size: 30px;
            line-height: 300px;
            border: 1px solid blue;
            border-top: 0px;
        }
        
        .tab div.current {
            display: block;
        }
    </style>
</head>

<body>
    <div id="app">
        <div class="tab">
            <ul>
                <li v-bind:class="currentIndex === index? 'active':'' " :key=' index ' v-for='(item,index) in list ' @click='handle(index)'>{{item.title}}</li>
            </ul>
            <div v-bind:class="currentIndex === index? 'current':'' " :key='index ' v-for='(item,index) in list '>
                <img v-bind:src=" item.path " alt=" ">
            </div>
        </div>

    </div>
    <script src="../vue.js "></script>
    <script>
        var vm = new Vue({
            el: '#app ',
            data: {
                currentIndex: 0,
                list: [{
                    id: 1,
                    title: 'apple ',
                    path: './apple.png '
                }, {
                    id: 2,
                    title: 'orange ',
                    path: './orange.png '
                }, {
                    id: 3,
                    title: 'lemon ',
                    path: './lemon.png '
                }]
            },
            methods: {
                handle: function(index) {
                    this.currentIndex = index
                }
            }
        })
    </script>
</body>

</html>